ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI=1S/C5H9NO4.Na/c6-3(5(9)10)1-2-4(7)8/file?format=sdf&get3d=True  -- InChI=1S/C5H9NO4.Na/c6-3(5(9)10)1-2-4(7)8 could not be loaded.